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Device and method for on-line detection of high-voltage switches

A high-voltage switch and detection device technology, applied in measurement devices, force/torque/power measuring instruments, instruments, etc., can solve the problems of bad social impact, failure of high-voltage switches to trip and extinguish arcs, and degradation of high-voltage power grid operation quality. The effect of online quantitative monitoring, avoiding catastrophic accidents and improving operation quality

Inactive Publication Date: 2010-02-17
SHAANXI ANZHONG MACHINERY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Fatigue failure will cause the compression spring to yield and lose its elasticity, so that the high-voltage switch cannot trip and extinguish the arc, so the high-voltage power grid is in a short-circuit state, resulting in catastrophic accidents, resulting in huge economic losses and bad social impact
The current periodic overhaul of high-voltage switches in the high-voltage power transmission and distribution industry is only a qualitative understanding of the fatigue failure phenomenon of compression springs, and cannot quantify the degree of fatigue failure
The reuse of compression springs with mixed quality during overhaul not only creates hidden dangers of accidents, but also makes the reliability of high-voltage switches lower than the factory level, resulting in a decrease in the operating quality of high-voltage power grids

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0009] Example 1: The high-voltage switch of the 110kV high-voltage power grid adopts ￠5 60Si2Cr spring steel wire to form a compression spring, and its full-service tensile stress is 1800MPa, and its yield limit is 1200MPa. A strain gauge is installed in the middle of the spring, the stress sensor detects the stress in real time, the four-digit MPa meter displays the stress, and the analog / gain amplifier processes the real-time detection signal. When the real-time detected stress value is close to 1200MPa, the stroboscope will give a red light alarm.

Embodiment 2

[0010] Example 2: A high-voltage switch for a 330kV high-voltage power grid uses ￠50 60Si2Cr spring steel wire to form a compression spring. The fully functional tension is 30,000N, and the damage tolerance tension is 27,000N. A load cell is installed at the spring retainer to detect the tension of the compression spring in real time, the four-digit kilogram force digital meter displays the tension, and the analog / gain amplifier handles the real-time detection of tension. When the tension value detected in real time is close to 27000N, the buzzer will alarm.

Embodiment 3

[0011] Example 3: A high-voltage switch for a 550kV high-voltage power grid uses ￠50 60Si2Cr spring steel wire to form a compression spring. The fully functional tension is 30,000N, and the damage tolerance tension is 27,000N. A load cell is installed at the spring retainer to detect the tension of the compression spring in real time, the four-digit kilogram force digital meter displays the tension, and the analog / gain amplifier handles the real-time detection of tension. When the tension value detected in real time is close to 27000N, the high voltage power grid is automatically isolated.

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Abstract

The invention discloses a device and a method for on-line detection of high-voltage switches, which helps to monitor the performances of compression springs of the high-voltage switches under causative conditions in real time, avoids disastrous accidents induced by spring yielding, and is favorable for grading the causative compression springs during the overhaul of the high-voltage switches so asto achieve on-line control on overhaul operation. The method comprises the following steps: (1) designing the complete-energy causativity of the compression springs, and tension or stress values of damage tolerance; (2) using a force measurement or stress sensor to detect the tension or stress of the compression springs under the causative conditions in real time; (3) allowing a system to automatically alarm or isolate high-voltage power grids when the tension or stress values detected in real time is lower than the damage tolerance; and (4) using the detection device to grade the causative compression springs when the high-voltage switches are overhauled and installing the compression springs of the same grade on the high-voltage switches of one high-voltage power grid. The invention hasthe advantage of improving the operation quality of the high-voltage power grids.

Description

technical field [0001] The invention belongs to the technical field of equipment manufacturing, and in particular relates to the service information collection and processing technology applied to high-voltage switch compression springs. Background technique [0002] The spring that controls the working state of the high-voltage switch is a large helical compression spring made of ￠5~￠50 spring steel wire. Generally, after quenching and tempering heat treatment at medium temperature, when the hardness reaches HRC45-50, it is installed on the high-voltage switch with the help of compression load. Once the material of the spring steel and its quenching and tempering heat treatment system, the assembly of the compression spring produce deviations in the engineering sense, the compression spring will be in danger of fatigue failure under the operating conditions of the high-voltage switch. Fatigue failure will cause the compression spring to yield and lose its elasticity, so th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01L5/00
Inventor 余少军王忠平
Owner SHAANXI ANZHONG MACHINERY
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